Perineal seeding of prostatic carcinoma after needle biopsy

The rarity of implantation of carcinoma of the prostate is generally accepted. In the last twenty years, there have been only 6 cases reported in the literature. We add a seventh case which is unique in that the seeding occurred after biopsy and intense radiotherapy was the only mode of treatment. We recommend that a sterilizing dose of radiotherapy be given to the perineum after perineal needle biopsy.